INNER BASES—15-POUNDER GUN MOUNTS,
148
No. 725S.
Marks, 20315 Diameter, ".505.
Sectional area, .20 square inch. Gauged length, 2".
Applied loads per square inch.	Elongation per inch.	Successive elongation per inch.	Permanent set.	Successive permanent set.	Remarks.
Pounds. 1,000 5,000 10,000 20,000 30.000 34.000 35.000 36.000 37.000 38.000 39.000 73,550	Inch. 0. . 00010 . 00030 .00060 .00100 .00115 .01050 . 01100 .01155 .01290 .01410	Inch. 0. .00010 . 00020 . 00030 .00040 .00015 .00935 .00050 . 00055 . 00135 .00120	Inch. 0. 0.	Inch. 0. 0.	• Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
					
General summary.
Tensile strength per square inch of original section..............................pounds.. 73,550
Elastic limit per square inch of original section....................................do... 34,000
Elongation per inch after rupture...................................................inch.. . 2150
Elongation per inch under strain at elastic limit...................................do... . 00115
Reduction in diameter at point of rupture............................................do...	.065
Reduction in area after rupture, per cent of original section............................. 23.9
Position of rupture.............................................................middle of stem
/m.	.	!■ l	1	. 1' . . .	n.«..	.1 Oil	11 1 1 nmAiml\All£l SA 1\A1» AAI't־
Character of broken surface.............granular 30 per cent; dull amorphous 70 per cent
Elongation of inch sections.........................................."• 22*, 21 .״
No. 7223.
Marks, ^bi5 Diameter, ".505.
Sectional area, .20 square inch.
Gauged length, 2".
Applied loads per ־ square ‘inch.	Elongation per inch.	Successive elongation per inch.	Permanent set.	Successive permanent set.	Remarks.
Pounds. 1,000 5,000 10,000 20,000 23.000 24.000 25.000 26.000 27.000 28.000 29,000 57,400	Inch. 0. .00015 .00035 . 00075 .00090 . 00095 . 00850 .00960 . 01020 .01190 .01250	Inch. 0. .00015 .00020 .00040 .00015 .00005 .00755 .00110 .00060 .00170 .00060	Inch. 0. 0.	Inch. 0. 0.	Initial load. Elastic limit. Tensile strength.
					
					
					
					
					
					
					
					
					
					
..........pounds.. 57.400
..............do... 24,000
.............inch.. .2100
..............do... .00095
..............do...	.075
.................... 27.4
........... ".85 from neck
silky, trace of granulation
*27.״ ,15.״ ..............
General summary.
Tensile strength per square inch of original section....
Elastic limit per square inch of original section.......
Elongation per inch after rupture.......................
Elongation per inch under strain at elastic limit.......
Reduction in diameter at point of rupture...............
Reduction in area after rupture, per cent of original section.
Position of rupture.....................................
Character of broken surface.............................
Elongation of inch sections.............................